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Answer Monday!

Last week's Fossil Friday was apparently a tough one. Only 4 guesses—and half of them were for sloths! The correct answer was quickly supplied by Joshua Vallejos.

Says anthropologist Eric Meikle:

"The fossil is usually referred to either Homo ergaster or Homo erectus, depending on one’s views about early species within the genus Homo.

This specimen is known as KNM-WT 15000. It was found in 1984 along with many other associated bones of a partial skeleton at the site of Nariokotome, west of Lake Turkana in northern Kenya. This site is about 1.6 million years old."